I would really love this feature to be implemented!! It would make gameplay all the more fun and memorable and lifelike :D Perhaps when the player hasn't moved for awhile, the following Pokemon could do it's own thing, like venturing out some distance from the player, or doing a dance, or blowing a fireball/spout some water, that sort of thing. :3 When the player wants to call the Pokemon back, there could be an option to whistle to it to alert it back to the player's side or something. That's just my opinion.

About asking GF to implement this feature, I don't know whether they would receive feedback from emails, but one could always try. :3